When we try to finish a formula, sometime we need to convert Kilograms to Newtons because we want a force measurement and not a mass measurement. When the calculation begins, for example, you are only having a kilogram of weight, but you are being asked the force of a unit. This problem can only be solved by knowing the right amount of mass and the acceleration unit. This problem occurs because Newtons cannot be converted directly to Kilograms. This thing will happen because they are purposed for measuring different variable.

Newtons is used as the SI unit of force, while Kilograms are meant for measuring unit of mass in SI. Before doing any converting, be sure to know that mass unit is also different with weight unit. When we are talking about mass, then we are talking about gravity that is independent. While weight is different in each planet, for example, our weight in earth is different with our weight in moon or mars. This is happen because each planet has different gravitation strength. The naming confusion begins because we often mistook that a weight is the same with a mass. We used to talk about weight and at the same time talking about mass without knowing that these things have different meaning. If we are talking about Newtons, then we are talking about how much force required accelerating one mass of Kilograms until it reach speed 1 ms-2 (one meter per second per second).

The basic formula of force (Newtons) is Force = mass x acceleration, F=ma. This formula alone can help us convert Kilograms to Newtons. As we live on Earth, we will use our “local” gravitational acceleration which is approximately 9.8ms-2, (9.80665002...ms-2). It means, If we calculate the weight of 1 Kilograms object in earth is approximately ~9.8N (9.8ms-2 multiply 1 Kilograms). As we know from the past formula: A is 9.8ms-2, m is 1kg, it makes F= m x a = 9.8N. Continue with the second formula; assume that this object has a certain weight measured on Earth of 1 N; we will get a mass of approximately ~0.1kg (the conclusion comes from a is 9.8ms-2, F is 1N, and m is F / a = ~0.1kg). In detailed report of professional researcher, 1 kilogram is equal to 9.80665002864 N. but if just practicing with your student task, you can use 1 kilogram which is equal to 9.8 N.